From an article on the usefulness of subtitles in learning accents in foreign languages published by the journal Science:

"For the study, Dutch students who were fluent in English watched either a 25-minute episode of the Australian sitcom Kath & Kim, whose characters speak in broad accents from the Melbourne suburbs, or a version of Trainspotting, which was edited down to the same length by taking out the offensive parts."

According to the IMDB, Trainspotting has a 94 minute running time, so they cut out 69 minutes. That's pretty impressive.